fix: exports types

Author: skarab42

package.json

@@ -24,15 +24,18 @@
   "exports": {
     ".": {
       "require": "./build/index.js",
-      "import": "./build/index.mjs"
+      "import": "./build/index.mjs",
+      "types": "./build/index.d.ts"
     },
     "./tsd": {
       "require": "./build/api/tsd/index.js",
-      "import": "./build/api/tsd/index.mjs"
+      "import": "./build/api/tsd/index.mjs",
+      "types": "./build/api/tsd/index.d.ts"
     },
     "./tssert": {
       "require": "./build/api/tssert/index.js",
-      "import": "./build/api/tssert/index.mjs"
+      "import": "./build/api/tssert/index.mjs",
+      "types": "./build/api/tssert/index.d.ts"
     }
   },
   "typesVersions": {